mjhjmtu

we have linux OS with OS - sda and another disk for data

 df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/vg55-lvm_root 41932800 19731580 22201220 48% /
devtmpfs 16372376 0 16372376 0% /dev
tmpfs 16387592 108 16387484 1% /dev/shm
tmpfs 16387592 1741416 14646176 11% /run
tmpfs 16387592 0 16387592 0% /sys/fs/cgroup
/dev/mapper/vg55-lvm_var 105756672 54652856 51103816 52% /var
/dev/sdb 72117368 72100984 0 100% /data
/dev/sda1 508588 160024 348564 32% /boot

 PV VG Fmt Attr PSize PFree
 /dev/sda2 vg55 lvm2 a-- 149.51g 92.00m
#

the problem is that /data is full , and we want to add another new disk from the VMcenter in order to extend the sdb disk to 200G

please advice how to perfrom the steps

It seems that /data is not managed with LVM so you might add space so /dev/sdb via vCenter and then grow the file system in CentOs

xfs_growfs /dev/sdb

LVM

If you want to have LVM for /data, that will be a bit longer.

Add the disk to VMware, make it show in CentOS :

List host bus numbers :

ls /sys/class/scsi_host/ 

For each host bus, scan the bus (where [hostX] is the name you get from the previous command):

echo "- - -" > /sys/class/scsi_host/[hostX]/scan

Check the names of your SCSI devices

ls /sys/class/scsi_device/

Rescan the SCSI buses (name are in form X:X:X:X)

echo 1 > /sys/class/scsi_device/X:X:X:X/device/rescan

Then you can fdisk -l to see your disk

First, you need to create a new Physical Volume with the new disk.

I assume that the disk will be sdc.

pvcreate /dev/sdc

Then you can create a new VG or use the existing one :

I assume you'll use the existing one :

vgextend vg55 /dev/sdc

You need to create a Logical Volume to use now

lvcreate -L200G -n lvm_data vg55

You now need to create a filesystem on this volume

mkfs.xfs /dev/mapper/vg55-lvm_data

You now have a 200GB disk that can be mounted. You might mount lvm_data somewhere, copy /data to the new volume, unmount /data and the lvm_data, and mount /dev/mapper/vg55-lvm_data /data.

To add /dev/sdb to the LVM (if needed).

Once you have your date moved elsewhere :

pvcreate /dev/sdb

Confirm you want to wipe the filesystem on /dev/sdb with y

Add /dev/sdb to the existing VG

vgextend vg55 /dev/sdb

Then you can allocate that space to the lv you want with

lvextend -L68G /dev/vg55/data